Blunderzone

Blunderzone turns your real chess mistakes into focused tactics training.

Most chess trainers give you random puzzles. Blunderzone starts with the games you actually play, finds critical moments, and turns them into practice you can repeat. The result is a training flow that matches your openings, time controls, habits, and recurring tactical weaknesses.

Key features:

- Train from your own imported chess games
- Review game-based tactics created from missed opportunities
- Solve quick 10-puzzle sessions for speed and pattern recognition
- Use spaced repetition to keep important positions fresh
- Track streaks, ratings, progress, and puzzle states
- Add OTB games and review the positions you enter
- Upgrade to Basic or Premium for expanded limits and deeper analysis

Blunderzone is for chess players who want practical improvement. Your past blunders become a personalized training plan, so every session is tied to positions you are likely to see again.

The app supports free training and optional monthly memberships. Subscriptions are managed by Google Play.